Is it useful to drink Banlangen on fire

Isatis root is bitter and cold in nature, returning to the heart and stomach meridians. It has the functions of clearing away heat and toxic materials, cooling blood and relieving pharynx. It is mainly used to treat wind-heat cold and influenza. It is useful to drink Isatis root on fire. It is effective to treat heart-fire and stomach-fire according to Isatis root's nature, returning to meridians, bitter and cold, returning to heart and stomach meridians. Heart fire and stomach fire can be manifested as throat pain, fever, upset, stool knot, yellow urine, red tongue, yellow fur, pulse number, etc. This kind of excessive heat can be treated with Radix Isatidis.